Indeed they're all ultrathin surfaces. I modelled everything myself. the logo and GT4 I drew in MicroStation (A kind of AutoCAD), with pictures from the internet as refrence. The license-plate I also drew in Microstation. I took all the dimensions from the license-plate of my own car (including all the nummbers, stars, letters etc..) Nevertheless, I'll keep in mind everything what is said about bumpmapping, who knows when it comes in handy.